SATA_DOWN_SPD_LIMIT(9) libata Core Internals SATA_DOWN_SPD_LIMIT(9)NAME
sata_down_spd_limit - adjust SATA spd limit downward
int sata_down_spd_limit(struct ata_link * link, u32 spd_limit);
Link to adjust SATA spd limit for
Adjust SATA spd limit of link downward. Note that this function only adjusts the limit. The change must be applied using sata_set_spd.
If spd_limit is non-zero, the speed is limited to equal to or lower than spd_limit if such speed is supported. If spd_limit is slower than
any supported speed, only the lowest supported speed is allowed.
Inherited from caller.
0 on success, negative errno on failure
COPYRIGHT Kernel Hackers Manual 3.10 June 2014 SATA_DOWN_SPD_LIMIT(9)
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ATA_SLAVE_LINK_INIT(9) libata Library ATA_SLAVE_LINK_INIT(9)NAME
ata_slave_link_init - initialize slave link
int ata_slave_link_init(struct ata_port * ap);
port to initialize slave link for
Create and initialize slave link for ap. This enables slave link handling on the port.
In libata, a port contains links and a link contains devices. There is single host link but if a PMP is attached to it, there can be
multiple fan-out links. On SATA, there's usually a single device connected to a link but PATA and SATA controllers emulating TF based
interface can have two - master and slave.
However, there are a few controllers which don't fit into this abstraction too well - SATA controllers which emulate TF interface with both
master and slave devices but also have separate SCR register sets for each device. These controllers need separate links for physical link
handling (e.g. onlineness, link speed) but should be treated like a traditional M/S controller for everything else (e.g. command issue,
slave_link is libata's way of handling this class of controllers without impacting core layer too much. For anything other than physical
link handling, the default host link is used for both master and slave. For physical link handling, separate ap->slave_link is used. All
dirty details are implemented inside libata core layer. From LLD's POV, the only difference is that prereset, hardreset and postreset are
called once more for the slave link, so the reset sequence looks like the following.
prereset(M) -> prereset(S) -> hardreset(M) -> hardreset(S) -> softreset(M) -> postreset(M) -> postreset(S)
Note that softreset is called only for the master. Softreset resets both M/S by definition, so SRST on master should handle both (the
standard method will work just fine).
Should be called before host is registered.
0 on success, -errno on failure.
COPYRIGHT Kernel Hackers Manual 3.10 June 2014 ATA_SLAVE_LINK_INIT(9)
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